Its a completely personality thing. There is no right or wrong (in taking companions, whoever it maybe, with you on tour). If I were in Kohli's shoes, I would take my girlfriend or wife on tour with me if the opportunity presents because I need company in my lonely time, and I can handle personal life away from professional life and will not let both conflict each other. The only thing to see if, if the girlfriend or wife disrupts the time you need to spend on training and preparation for the game. If they do, then they should be barred from joining the professional on tour. But that also should be on a case by case basis. You can't just throw out a blanket and say "no wife or girlfriend allowed on tour for ANYONE".